In most cases it is best to deSelect the "Enable the next-generation Java Plug-in" check-box at the Java control panel -> Advaned Tab -> Java Plug-in -> Enable the next-generation Java Plug-in
You can do it automatically:
"C:\Program Files\Java\jre6\bin\ssvagent.
or revert it back by:
"C:\Program Files\Java\jre6\bin\ssvagent. exe" -high -jpisetup –new